Is it possible to bevel a text mesh
Here's the workflow from the Text Object itself.



Here's the workflow after Text has been converted to Mesh.


Use Limited Dissolve 1st. On the "Tool Shelf" You may need to slide the angle limit around. Alternatively on the delete menu, you can select Dissolve Faces directly, depending on the circumstance this may give you a more accurate dissolve for this purpose.
Ctrl+B - With the Top Edges Selected to Bevel.